| Bittorrent Unfinished Download Format | |
| BitComet | |
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BC is a temporary torrent file used by BitComet, a P2P BitTorrent client software, for storing incomplete torrent files. BitComet is free and easy to use.
BC file stores data downloaded for the network. After downloading is complete, BC suffix is changed into proper file extension. BC files allow client to resume download process at a later time after it has been paused or the connection has been dropped.
| .aawdef | Ad-Aware Definitions Format |
| .abr | Adobe Photoshop Brush Format |
| .ac$ | AutoCAD Undo Info Format |
| .acc | DR DOS - ViewMax Format |
| .acl | Microsoft Office Automatic Correction List |
| .acs | Microsoft Agent Character Structured Storage Format |
| .ad | After Dark Screen Saver Format |
| .add | Microsoft Dynamics AX Developer Documentation Format |